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SYSTEM AND METHOD FOR LOCKING AND UNLOCKING PATIENT TABLE ACTUATION MECHANISM

Publishing Venue

The IP.com Prior Art Database

Abstract

Systems and methods for locking and unlocking the patient board vertical actuation mechanism in a detachable table for MRI machines are disclosed. The invention describes mechanical methods using linear brake, cam brake or wheel restraining to lock the scissor lift, thus relieving the constant loading of the hydraulic system. The locking mechanism is configured to get locked automatically when the patient is raised to the uppermost position. With a snap action, the locking mechanisms unlock and do not need a positive source for the same. The advantages of the invention include reducing the cost of hydraulic components, and removing the need for constant maintenance.

Country

Undisclosed

Language

English (United States)

This text was extracted from a Microsoft Word document.

At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
36% of the total text.

SYSTEM AND METHOD FOR
LOCKING AND UNLOCKING PATIENT TABLE ACTUATION MECHANISM

BACKGROUND

The
invention relates to systems and methods for locking and unlocking the patient
board vertical actuation mechanism in a table used in magnetic resonance imaging (MRI) machines. The table is configured with scissor lift assembly for
upward and downward movement of the patient board. In current systems, a hydraulic
actuator is used for holding the board at the top position, as shown in FIG. 1.
This arrangement requires high precision of hydraulic components to avoid
leakages while loading the actuator. The hydraulic actuator will be loaded even
more with the increase in the patient weight that is required to be carried by
the system. In some instances, the detachable table is docked to the magnet and
kept for long periods at the top
level. This leads to continuous loading of the hydraulic actuator. These actuators
suffer from leakage problem and routine service is required to keep them in
working order. One current solution is to lock the hydraulic actuator directly
using mechanical clamps. These clamps are held in place by pneumatic or
hydraulic means and require a positive source of energy to unlock the clamps. The
scissor assembly is locked using manual operations, which have to be repeated
before the scissors can be
unlocked. Thus, there is a need for a better locking mechanism which could
relieve the constant loading on the actuator in the table.

FIG. 1: Patient table in the magnetic resonance imaging (MRI)
system

BRIEF DESCRIPTION OF DRAWINGS

The
invention discloses systems and methods for locking and unlocking the patient
board vertical actuation mechanism in a detachable table, wherein:

The
invention proposes systems and methods for locking and unlocking the patient
board vertical actuation mechanism in a detachable table for MRI machines. The
disclosure describes mechanical methods to lock the scissor lift, thus
relieving the constant loading of the hydraulic system. The methods include three
mechanisms, namely, 1) linear brake, 2) cam brake and 3) wheel restraining, configured
to get locked automatically when the patient is raised to the uppermost
position. With a snap action the locking mechanisms unlock and do not need a
positive source.

The
configuration of the scissor lift mechanism with locking arrangement is illustrated
in FIG. 2. The locking mechanism is deployed at the bottom of the scissor lift
and placed on the base of the table. The locking mechanism comprises a bottom
roller, a locking rod and a brake, as shown in FIG. 2...